Mirjana Karanovic, Marija Skaricic, and Ljubica Jovic don't speak German or Swiss-German. Although the script had all the German texts translated, they had to learn their lines by heart and act without having a true feeling for the language.
With the different departments being from Switzerland, the former Yugoslavia, and Germany, the official set-language was English, although during shooting all the actors' native languages were spoken and many things had to be translated more than once for everyone to understand.